md/raid10: Handle bio_split() errors

Add proper bio_split() error handling. For any error, call
raid_end_bio_io() and return. Except for discard, where we end the bio
directly.

Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20241111112150.3756529-7-john.g.garry@oracle.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>